Add MS Graph as a supported service in the Office 365 CLI so that it's possible to communicate with its API. When connecting to MS Graph, allow specifying the ID of the AAD app to use for communication, since there isn't a default one we can use.

Use the same AAD app ID as in PowerShell PnP: https://github.com/SharePoint/PnP-PowerShell/blob/69b7923ecb13db9a7b7edca2bedcfd08254242e3/Commands/Base/ConnectOnline.cs#L82